Center-bearing for cars.



W. J. STEWART & J. D. MoKINNON.

CENTER BEARING FOR CARS. APPLICATION II LED MAY 31,1910.

Patented Apr. 25,

UN TE sTA s PATENT OFFICE.

WILLIAMJOHN STEWART AND JOH DANIEL McKINNoN, or INVERNESS, NOVA SCO'IIA,

- CANADA;

onNTEaBEA'nINe FOR cans.

To. all whom "it may concern:

Be it known that we, STEWART and JOHN DANIEL MCKINNON, of Inverness, in' the Province of Nova Scotia, Canada, haveinvented certain new and useful Improvements in Center-Bearings for Cars,'of which the following is a specification,

Our invention relates to improvements in -center bearings, such as may be used for cars, carriages, engines or like purpose, and the objects of our invention are to provide a bearing which, will be sensitive to unevenness'in the road,whereby, the flange and rail wear will be reduced to a minimum and derailmentbecome less liable, and the train rendered easier to haul.

Further objects are to provide such a bear- ,ing as will permit uniform distribution of the weightof the car when taking a curve and generally to provide an improved and more eflicient form of center bearing bet: ter adapted to resist strain-and perform the functions required of'it.

In its construction the invention includes two members, one 0 which is formed with a convex projection fitting into a concaved socket on the other member, said rojection being formed with a series o annular grooves containing balls, the grooves being constructed to prevent outlet of the balls and having an inlet at one point through which the balls may be introduced, the convex projection being further formed at the center with a recess adapted to receive a projection The member A which may be conven iently made in the form of a casting, is formed with a plate 10 having bolt holes 11 through which it may be attached to the part to which it is to be secured.

Integral with the plate is aconvex projection 12: having a partially'spherioal outer WILLIAM JOHN on the opposite member, all-as hereinafter more fully set forth and d'e-- Y outer face,

formed wlth a concave socket, and an upper Specification of Letterslatent. at t Apr, 25, 1911, Application filed May 31, 1910. Serial No. 564,307.

surface adapted to fit into a corresponding surface which forms the wall of a concaved recess 13 on the member .13, said member being' provided at the center with a convex projection 14; entering'a concave socket 1.5 on the member A.

To reduce friction between the two parts" of the bearing, a plurality of ball raceways 16 are formed in theprojection 12, said raceways being in the form of annular 'rooves having constricted openings'adapted to normally retain the balls 18, said balls being adapted to be introduced into the grooves through suitable notches 17 provided at a determined point in the periphery of the groove.

The facesof the casting are shaped to fit closely together and will be suitably machined to provide a smooth wearing surface.

- The faces will also preferably be chilled in any well known way.-

The convex shape of.the, projection 12- enables the strain tobe uniformly distributed and centralized, thereby, providing a bearing which will permit free and easy movement of the two parts, and at the same time hold them' in their relative position.

As many changes could be made in the above construction and many apparently Widely different embodiments of my inven tion within the scope of the claims constructed without departing from'the spirit or scope thereof, it is intended that all mat ter contained in the accompanying'specifications and drawings shall be interpreted as illustrative and not in a limiting sense. The projection 14: is. adapted to at once preventv the entrance of dust between the members and assist in preventing lateral displacement ofthe upper member, the perforation in the projection being a center pin of-usual form.

What we claim as our invention is:

1.'A center bearing for cars comprising a lower member having an integral convex projection formed with a partially spherical the center of the projection being member formed with a concave recess to fit the projection and a convex projection to fit the socket, said members being free to tilt with respect to each other and contacting only along the curved surfaces.

2. A center bearing for cars comprising I a lower member having an integral convex projection formed with a partially spherical outer face, the center of the projection being formed w th a concave socket, and an upper member formed with a concave recess to fit the projection and a convex projection to fitthe socket, said members being free to tilt with respect to each other and cont-acting only along the curved surfaces, and one of said membersbeing formed with grooves containing balls.

3.- A center bearing for cars comprising a lower member having an integral convex projection formed with a partially spherical outer face, the center of the projection being formed with a concave socket, and anupper member formed with a concave recess to fit the projection and a convex projection to fit the socket, said members being free to tilt with respect to each other and contactin only along the curved surfaces, one of'saic members being-formed with grooves containing balls and the other being formed with a. series of concentric grooves having restricted openings adapted to permit the a central recess and a central opening, said recess having a downwardly and inwardly curved wall conforming to the curvature of and spaced from said central projection, whcr by-said upper member is free to tilt with respect to said lower member. 7

In witness whereof we have hereunto set our hands in the presencc of two witnesses.

WILLIAM JOHN STEXVART. JOHN DANIEL MCKINNON.

Witnesses I DANL. S. MoNmL, JEREMIAH PHILLIPS.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. G. 

